Printing Group of a Printing Press

ABSTRACT

The invention relates to a printing unit ( 3 ) of a printing machine, preferably a rotary printing machine, which is comprised of at least one ink transfer roller ( 27 ), at least one bearing block ( 4 ) movable relative to the printing unit frame ( 2 ), in which, in the printing position, one end of the ink transfer roller ( 27 ) can be supported, and which releases that end of the ink transfer roller ( 27 ) in its released position, and a blade chamber holder ( 16 ), which carries at least one blade chamber ( 31 ) that can be adjusted on the ink transfer roller ( 27 ) and which is connected rotatably and displaceably with the bearing block ( 4 ) in the printing position, whereby the blade chamber holder ( 16 ) is supported permanently on the bearing block ( 4 ) by means of the support elements ( 18, 28 ) on the bearing block ( 4 ).

The invention relates to the printing unit of a printing machine according to the preamble of claim 1.

Printing machine of this kind is known from the DE 197 05 369 A1. In that design, the pressure and ink transfer rollers are supported on their first ends, each with overhanging one end in a bearing block supported by guide rails. In order to avoid vibrations of the rollers during the press operations, their second ends are supported with the help of prop bearings, which, in their turn, are mounted on the bearing blocks. The prop bearings can be released from the rollers and can move together with the bearing blocks. Thus, the second, free ends of the rollers can be released, for example, for the purpose of changing the sleeves or for other tasks. Since the bearing blocks carrying the prop bearings must be moved, but the bearing blocks in which the rollers are supported overhanging are held fast, it is also necessary to release the blade chamber which connects both the bearing blocks, or the blade chamber holder of the bearing block, which carries the prop bearing. For that purpose, in the known types of printing machines, in the printing position of the bearing block, pins are inserted into the bore holes interspersed in the bearing blocks that carry the prop bearing, which also grip tapped blind holes made in the blade chamber holder of the coater chamber. Now, if this bearing block is to be moved, the fixed connection between blade chamber holder and bearing block are separated by taking out the pins. The disadvantage of such a device is that the blade chamber holder is then supported by the printing machine frame,

whereby the blade chamber buckles through due to the distance between blade chamber holder and the printing machine frame. At the same time it can also result in slipping movements in case of printing units not built in horizontal position, so that damage to the ink transfer roller cannot be ruled out.

Therefore the task posed by the present invention is to propose an arrangement for the printing unit, in which possible displacement and buckling of the blade chamber are avoided after loosening the fixed attachment with the bearing block.

This task is solved by permanently propping up the blade chamber holder associated with the second bearing block by means of supporting elements on the second bearing block. Therefore, the blade chamber holder does not need to be completely released from the second bearing block. The blade chamber and the blade chamber holder supporting it need no longer be set down on the printing machine frame. Furthermore, the manual work connected with the loosening and retightening of the connections between the blade chamber holder and the bearing block need not be done any more.

Thereby, it is especially advantageous if the supporting elements consist of at least a linear guide, which are attached to the blade chamber holder in such a fashion that the second bearing block is displaceable relative to the blade chamber holder. In that manner, the bearing block can be displaced without causing deformation of the blade chamber due to the lifting and the lowering movements.

It is of advantage if the supporting elements are comprised of a track fixed on the blade chamber holder and a guiding slot is firmly connected with the bearing block. It is thus possible to move the bearing block relative to the blade chamber holder for releasing the free end of the printing roller without needing to completely separate the blade chamber holder from the bearing block.

Should the bearing block be brought into the release position, then, in a preferred embodiment, the blade chamber holder is arrested in the printing unit frame. With that the buckling of the blade chamber as a result of slipping at an end side of the printing unit that is not horizontally arranged is avoided and consequently possible damage to the surface of the ink transfer roller are forestalled.

Thereby, it is especially advantageous if the blade chamber holder is alternately attached with the bearing block or the printing unit frame. For that purpose, it can be equipped with a stop bolt attached displaceably with the blade chamber holder, which connects the blade chamber holder firmly at one of its end positions with the bearing block and at its other end position, it grips into a recess of the printing device frame.

In order to rule out releasing of the stop bolt from the described end position by accident, it is advantageous to provide an elastic thrust pad on the blade chamber holder. Thereby the ball of the elastic thrust pad grips a groove made in the stop bolt.

In order to ensure a tight fit between the blade chamber holder and the anilox roller block, it is of advantage if a stop plate is fixed on the anilox roller block, which can be clamped between the stop bolt and a stopper.

In order to prevent the play that appears after frequent displacement of the stop bolt between the stopper plate and the stop bolt, in a preferred embodiment, both the elements are provided in the mutually facing areas with mutually parallel slant, so that the play due to the changes in the distance adjustment of the stop bolt is eliminated.

If the blade chamber holder must be fixed on a printing unit frame, it is of advantage to equip it with a receiver fixed on the printing unit frame for that purpose.

It is of advantage if a means for actuating displacement can act on the stop bolt.

In a preferred embodiment, the means for the displacement of the stop bolt is comprised of a drive unit, as well as a means for transmitting the driving force.

Thereby a piston cylinder unit can be provided as the drive unit.

It is of advantage thereby if the means for transmitting the drive force is comprised of a receiver attached to the piston of the piston cylinder unit, which encloses a pin fixed on the stop bolt in the print position of the anilox roller block. It is thus possible to provide the piston cylinder unit on the anilox roller block. This type of arrangement offers the advantage that the leads to the driver of the piston cylinder unit can be laid parallel to other devices located, driven or actuated through the anilox roller block.

An instance of an embodiment of the invention is explained in detail with the help of the drawings. The individual figures show:

FIG. 1 Side view of a printing unit of a flexo-printing machine of known type

FIG. 2 Side view of a section of a printing unit of the type according to invention, whereby the anilox roller block is in the release position.

FIG. 3 View of the inking unit according to FIG. 2.

FIG. 4 View of the inking unit according to FIG. 3.

FIG. 5 Side view of a section of a printing unit of the type according to the invention, in which the anilox roller block is in printing position.

FIG. 6 View of the inking unit according to FIG. 5.

FIG. 7 View of the inking unit according to FIG. 6.

FIG. 1 shows a flexo-printing machine of the known type in printing position. A counter-pressure cylinder 1, on which the length of material sheet to be printed, not shown in detail here, is guided, is supported in a machine frame, not shown here. A printing unit frame 2, which is a part of the printing unit 3, is firmly attached with the machine frame. The rear printing unit frame, which is attached to the backside of the counter-pressure cylinder on the machine frame, is not visible here. In a flexo-printing machine, several inking units of this type, distributed across the periphery of the counter pressure cylinder, can be provided. During the printing operation, the printing roller 29 is supported by means of prop bearing 7. The prop bearing is supported by the printing roller frame, which is supported across the sled 13 on the guide track 12 and can be moved to and fro, along double arrow B, by means of the motor 14 and the spindle 15. The guide rail 12 is connected firmly with the printing unit frame.

The anilox roller 27 is supported raster roller bearing block 4 by a prop bearing 6. The sled 9, which runs along the track 8 fixed on the printing unit frame 2 and on which the anilox roller bearing block 4 is held fast, can be displaced, along double arrow A, by means of the motor 10 and the spindle 11. An ink chamber coater blade 31 is fixed on the blade chamber holder 16 in a manner not further described in detail here. This blade chamber holder 16 is fastened to the anilox roller block 4, in a manner secured against twists and movements, using two bolts 17, which grip through bore holes in the anilox roller bearing block 4 and grasp into the two bore holes of the blade chamber holder.

Now, in order to be able to remove, for example, the anilox roller sleeve from the cylinder core of the anilox roll, first the anilox roller block is detached from the printing roller (Printing-Off position). After that, the raster roller frame 4 must be displaced relative to the anilox roller 27 after releasing the prop bear 6 from the anilox roller 27. For that purpose, the blade chamber holder 16 must be separated from the anilox roller bearing block 4 by pulling out both the bolts 17. After the separation, the anilox roller block 4 can be moved into the so-called Release position.

Now, the FIGS. 2 to 4 show a section of the printing unit according to the invention. Display of the anilox roller bearing block 4 with the prop bearing as well as the guide elements is not shown in FIG. 2 for the sake of simplicity. The anilox roller is in the Printing-Off position and the bearing block 4 is in the Release position, which enables access to the anilox roll. On the blade chamber holder 16, a guide track 18 is fastened, which is enclosed by the guide wagon 28 displayed in FIG. 3. This guide wagon 28 is attached on its part to the raster roll bearing block 4. The stop bolt 19 is displaceable in the guides 21, 22 along arrow C. In the state of operation shown here, the stop bolts 19 is mounted above the stop bolt base 25 in the stop bolt support seat 26. In order to prevent an unintentional displacement of the stop bolt 19, an elastic thrust pad 37 is mounted in the blade chamber holder 16. The ball of the elastic thrust pad 37 acts thereby on a snap ring groove 40, which is mounted at the corresponding position in the stop bolt 19. The elastic thrust pad is not shown in FIG. 3 and FIG. 4 for the sake of better overview. The stop bolt seat is firmly fastened with the printing unit frame 2. At the anilox roller bearing block 4, a stopper plate 30 is fixed, which is comprised of a jut 39. The jut 39 is beveled on one side. The jut 39 and the bevel slant are thereby so dimensioned that the jut 39 can be arrested with the stop bolt head 24 and the stopper 23. Below the stopper plate 30, a piston cylinder unit 32 is fixed, whose piston 33 protrudes downward. On the piston is a receiver 34, as well as two rolls 35 are fastened on each of the two sides. The rolls 35 pass through the roll guides 36, 38 of which only the roll guide 36 is shown.

The FIGS. 5 to 7 show the same section of the printing unit according to the invention, whereby the anilox roller bearing block 4 is in the printing position. In order to reach this position, the anilox roller bearing block 4 is displaced in the direction toward the anilox roller 27, so that the prop bearing 6 can enclose the free end of the anilox roll. In that position of the anilox roller block, the receiver 34 mounted on the piston 33 also enclosed the pin 20 fastened in the stop bolt 19. Through actuation of the piston cylinder unit 32, the

stop bolts can be displaced upwards and thereby clamp the jut 39 of the stopper plate between the stopper 23 and the stop bolt head 24. A constant application of pressure exerted through the piston cylinder unit 32 ensures, due to the slants of the jut 39 and the cylinder head 38, clamping of the jut 39 free of play. Thus a reproducibly exact position of the blade chamber holder relative to the anilox roller block is enabled. However if, in a faulty operation, the pressure exerted by the piston cylinder unit 32 is absent, the stop bolts 19 can slide into a position, in which, as shown in FIG. 7, the ball of the elastic thrust pad 37 can act on the lower snap ring groove 40, so that farther movement of the stop bolt 19 is forestalled. Thus, even in case of absence of the pressure, adequate clamping of the jut 39 is ensured. LIST OF REFERENCE SYMBOLS 1 Counter-pressure cylinder 2 Printing unit frame 3 Printing unit 4 Anilox roller bearing block 5 Press roller block 6 Prop bearing for anilox roller 7 Prop bearing for pressure roller 8 Guide tracks for anilox roller block 9 Sleds 10 Motor 11 Spindle for anilox roller block 12 Guide tracks for pressure roller block 13 Sleds for anilox roller block 14 Motor 15 Spindle for pressure roller block 16 Blade chamber holder 17 Fixing bolts 18 Track 19 Stop bolts 20 Pin 21 Guide 22 Guide 23 Stopper 24 Stop bolt head 25 Stop bolt foot 26 Stop bolt seat 27 Anilox roller 28 Guide wagon 29 Pressure roller 30 Stopper plate 31 Ink chamber blade 32 Piston cylinder unit 33 Piston 34 Receiver 35 Rolls 36 Roll guide 37 Elastic thrust pad 38 Roll guide 39 Jut 40 Snap ring groove A Direction of movement of anilox roller block B Direction of movement of pressure roller block C Direction of movement of stop bolt 

1. Printing unit (3) of a printing machine, preferably a rotary printing machine, with at least one ink transfer roller (27, 29) whereby the first end of the ink transfer roller (27, 29) is supported rotatably on a first bearing block, whereby the second end of the ink transfer roller (27, 29) is supported by prop bearing (7, 9) connected rotatably with a second bearing block (4, 5), whereby the prop bearing (7, 9) can be released from the ink transfer roller (27, 29) and the second bearing block (4) is displaceable relative to the ink transfer roller (27, 29) and relative to the first bearing block, so that the second end of the ink transfer roller (27, 29) is freely accessible, and whereby each bearing block (4, 5) is associated with a blade chamber holder (16), which carry at least one ink chamber blade (31), which (31) is adjustable on the ink transfer roller (27, 29), whereby the blade chamber holders (16) are at rest with respect to the first bearing block during the displacement of the second bearing block (4, 5) characterized in that the blade chamber holder (16) associated with the second bearing block (4, 5) is permanently supported by support elements (18, 28) on the second bearing block (4, 5).
 2. Printing unit according to claim 1 characterized in that the supporting elements comprise of at least a linear guide (18), which is arranged on the blade chamber holder (16) in such as fashion that the second bearing block (4, 5) is displaceable relative to the blade chamber holder (16).
 3. Printing unit according to claim 1 characterized in that the supporting elements are comprised of at least one track (18) fixed on the blade chamber holder (16) and at least one guide wagon (28) fastened on the bearing block (4) enclosing the track.
 4. Printing unit according to claim 1 characterized in that the blade chamber holder (16) is connected wit the printing unit frame (2) in each positions of the bearing block (4), which is not a printing position.
 5. Printing unit according to claim 1 characterized in that a stop bolts (19) is displaceably supported along its axis on the blade chamber holder (16), which can be connected at one of its end position with the bearing block (4) and with its other end position with the printing unit frame (2).
 6. Printing unit according to claim 5 characterized in that the stop bolts (19) can be fastened in each of these end positions with the help of a ball of a elastic printing unit, which is mounted on the blade chamber holder (16), whereby the ball acts on one of the grooves (40) made in the stop bolt foot (19).
 7. Printing unit according to claim 5 characterized in that in the printing position, a jut (39) can be clamped on a stopper plate (30) fastened on the bearing block (4) between the stop bolt (19) and a stopper (23).
 8. Printing unit according to claim 5 characterized in that the jut (39) and the stop bolt (19) are comprised of slanting bevels running parallel on the mutually facing sides.
 9. Printing unit according to claim 5 characterized in that for connection of the blade chamber holder (16) with the printing unit frame (2) a support bolt (19) can be fastened in a receiver (26) fastened on the printing unit frame (2).
 10. Printing unit according to claim 5 characterized in that on the stop bolts (19) act the means for the displacement (32, 33, 34, 20).
 11. Printing unit according to claim 10 characterized in that the means for displacement is comprised of a drive unit (32) and a means for transmission of the driving force (33, 34, 20).
 12. Printing unit according to claim 11 characterized in that the drive is comprised of a piston cylinder unit (32).
 13. Printing unit according to claim 11 characterized in that the means for transmission of the driving force is comprised of a receiver (34), which encloses a pin (20) fastened on the stop bolts (19) in the printing position of the bearing block (4). 